Brassfield Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Silurian
 ....Lower Silurian
 .....Brassfield Formation
RTKentucky
 Illinois
 Indiana
 Ohio
 Tennessee
 Arkansas
SNConsidered to consist of lower dolomitic limestone, including Whitfieldella bed, and Plum Creek Clay Member above. In central N Arkansas, S Indiana, SW Illinois, central Kentucky, SW Ohio, and S Tennessee.